cli/command/node: remove uses of pkg/errors in tests

While there may be reasons to keep pkg/errors in production code,
we don't need them for these tests.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/node/promote_test.go

@@ -1,13 +1,13 @@
 package node
 
 import (
+	"errors"
 	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
 	"github.com/docker/cli/internal/test/builders"
 	"github.com/docker/docker/api/types/swarm"
-	"github.com/pkg/errors"
 	"gotest.tools/v3/assert"
 )
 
@@ -24,14 +24,14 @@ func TestNodePromoteErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.New("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
-				return errors.Errorf("error updating the node")
+				return errors.New("error updating the node")
 			},
 			expectedError: "error updating the node",
 		},
@@ -57,7 +57,7 @@ func TestNodePromoteNoChange(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleManager {
-					return errors.Errorf("expected role manager, got %s", node.Role)
+					return errors.New("expected role manager, got" + string(node.Role))
 				}
 				return nil
 			},
@@ -74,7 +74,7 @@ func TestNodePromoteMultipleNode(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleManager {
-					return errors.Errorf("expected role manager, got %s", node.Role)
+					return errors.New("expected role manager, got" + string(node.Role))
 				}
 				return nil
 			},